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I confess that I was agreeably surprised by the richness of the zoological and geological collections; I do not think any European expedition has done more or better; and in some departments, in that of the Crustacea, for example, the collection at Washington surpasses in beauty and number of specimens all that I have seen. It is especially to Dr. Pickering and Mr.
It gains its name from its rich fat, which is of a green colour; and its flesh is considered very much superior to that of all its relatives. The variety and kinds of Crustacea are almost numberless, from the largest lobster to the smallest crab.
The proof of this is that it is often impossible for us to say whether we are dealing with an organism growing old or with an embryo continuing to evolve; such is the case, for example, with the larvae of insects and crustacea.
There has been less entire extinction of the forms of life which once connected fishes with batrachians. There has been still less in some other classes, as in that of the Crustacea, for here the most wonderfully diverse forms are still tied together by a long, but broken, chain of affinities.
Picture to yourself a forest in the Hartz hanging on to the sides of the mountain, but a forest swallowed up. The paths were encumbered with seaweed and fucus, between which grovelled a whole world of crustacea.
Among Insects, the various Genera of the Butterflies differ in the combination of the little rods which sustain their wings, in the form and structure of their antennae, of their feet, of the minute scales which cover their wings, etc. Among Crustacea, the Genera of Shrimps vary in the form of the claws, in the structure of the parts of the mouth, in the articulations of their feelers, etc.
After the first curiosity the gropers apparently settled into the belief that the novel monster was harmless and clumsy, but useful in assisting them to their food. The species feed on Crustacea and marine worms, which shelter under rocks, mosses and sunken objects at the sea-bottom.
In these respects the countless varieties of insects agree so that they also like crustacea of various kinds seem to have been derived from wormlike animals with more simply segmented bodies. Indeed spiders and scorpions and their relatives of the group arachnida prove for similar reasons to be derivatives of the same original stock, and own cousins of the insects.
The line where the red and blue water joined was distinctly defined. The weather for some days previously had been calm, and the ocean abounded, to an unusual degree, with living creatures. In the sea around Tierra del Fuego, and at no great distance from the land, I have seen narrow lines of water of a bright red colour, from the number of crustacea, which somewhat resemble in form large prawns.
The intentional naturalization of foreign fish, as I have said, has not thus far yielded important fruits; but though this particular branch of what is called, not very happily, pisciculture, has not yet established its claims to the attention of the physical geographer or the political economist, the artificial breeding of domestic fish, of the lobster and other crustacea, has already produced very valuable results, and is apparently destined to occupy an extremely conspicuous place in the history of man's efforts to compensate his prodigal waste of the gifts of nature.
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